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Date: Thu, 21 Sep 2017 16:36:27 +0200
From: Christoph Hellwig <hch@lst.de>
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Cc: Christoph Hellwig <hch@lst.de>,
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Subject: Re: [PATCH V6 2/3] dma-mapping: Rework
        dma_get_cache_alignment()function
Message-ID: <20170921143627.GA18424@lst.de>
References: <1505811161-25246-1-git-send-email-chenhc@lemote.com> <1505811161-25246-2-git-send-email-chenhc@lemote.com> <20170919150252.GA23540@lst.de> <tencent_0C366F4D229840FF7D683E10@qq.com>
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On Thu, Sep 21, 2017 at 12:28:25PM +0800, 陈华才 wrote:
> Hi, Christoph,
> 
> I have changed dma_get_cache_alignment's return value, and I don't know whether those drivers want to return ARCH_DMA_MINALIGN unconditionally. So I pass a NULL for those drivers, in order to keep their old behavior.

Per our documentation yes, they do want ARCH_DMA_MINALIGN.  Please
Cc all the driver maintainers on your updated patch so that they can
review it, though.